Moog MSD Servo Drive Series

8.5.2Method(-13):Absoluteencoder
Method (-13) works in a similar way to method (-5) (see Section "Method (-5):
Absolute encoder" on page 194). However, in this method the home offset is used
to define the machine zero point, while in method (-5) it is used to define the
offset relative to the encoder’s absolute position.
The following is the difference between the machine zero points for each method:
 Method(-13):Actualvalue=Homeoffset
 Method(-5):Actualvalue=Absoluteencoderposition(firstneedstobe
determinedwithhomeoffset=0)+newhomeoffset
Method (-13) is significantly easier to use, as it eliminates the need to determine the
encoder’s absolute position at the machine zero point and back-calculate the actual
position.
Fig. 8.39: Set the machine homing point
MOOG
ID
No.: CB40859-001 Date: 02/2018
MSD Servo Drive- Device Help
191
8 Motion profile
8.5.3Method(-12):Setabsoluteposition(absolute
measuringsystem)
To set the machine homing point, the rotor or the linear axis is moved to the machine
homing point. The desired actual position is written to the "Offset" parameter, P 2234
MPRO_402_Homeoffset. Afterward, the axis must be referenced once. Every time
the axis is started thereafter, the absolute position is calculated automatically. Every
time a new homing operation is initiated, the machine homing point is reset to the
current position.
Fig. 8.40: Set the machine homing point